/*
 *  Copyright:  (C) 2018 LingYun IoT System Studio
 *              All rights reserved.
 *
 *  File name:  thread.c
 *Description:  Examples of multithreaded programming.
 *
 *    Version:  1.1
 *     Author:  Guo Wenxue <guowenxue@gmail.com>
 *		        Copied by Zhu Tianyin <zhuty_cn@163.com>
 *  ChangeLog:  1.0  Release initial version in 2018.
 *              1.1  Copy and change some details on "01/31/2021".
 */
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>

void *thread_worker1(void *args);
void *thread_worker2(void *args);

int main(int argc, char **argv)
{
    int            shared_var = 1000;
    pthread_t      tid;
    pthread_attr_t thread_attr;

    if( pthread_attr_init(&thread_attr) )  //If return 0,it succeed.
    {
        printf("pthread_attr_init() failure: %s\n", strerror(errno));
        return -1;
    }

    if( pthread_attr_setstacksize(&thread_attr, 120*1024) )
    {
        printf("pthread_attr_setstacksize() failure：%s\n", strerror(errno));
        return -1;
    }

    if( pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_DETACHED) )
    {
        printf("pthread_attr_setdetachstate() failure：%s\n", strerror(errno));
        return -1;
    }

    pthread_create(&tid, &thread_attr, thread_worker1, &shared_var);
    printf("Thread worker1 tid[%ld] created ok\n", tid);

    pthread_create(&tid, NULL, thread_worker2, &shared_var);
    printf("Thread worker2 tid[%ld] created ok\n", tid);

    pthread_attr_destroy(&thread_attr);

    pthread_join(tid, NULL);      //Wait until thread worker2 exit().

    while(1)    //Because of pthread_join above,main thread will not execute the following code.
    {
        printf("Main/Control thread shared_var：%d\n", shared_var);
        sleep(10);
    }
}

void *thread_worker1(void *args)
{
    int *ptr = (int *)args;

    if( !args )
    {
        printf("%s() get invalid arguments\n", __FUNCTION__);    //_x2
        pthread_exit(NULL);
    }

    printf("Thread worker1 [%ld] start running...\n", pthread_self());

    while(1)
    {
        printf("+++：%s before shared_var++：%d\n",__FUNCTION__, *ptr);
        *ptr += 1;
        sleep(2);
        printf("+++：%s after sleep shared_var：%d\n", __FUNCTION__, *ptr);
    }
    printf("Thread worker 1 exit...\n");

    return NULL;
}

void *thread_worker2(void *args)
{
    int *ptr = (int *)args;

    if( !args )
    {
        printf("%s() get invalid arguments\n", __FUNCTION__);
        pthread_exit(NULL);
    }
    printf("Thread worker2 [%ld] start running...\n", pthread_self());
    while(1)
    {
        printf("---: %s before shared_var++: %d\n", __FUNCTION__, *ptr);
        *ptr += 1;
        sleep(2);
        printf("---: %s after sleep shared_var: %d\n", __FUNCTION__, *ptr);
    }
    printf("Thread worker 2 exit...\n");

    return NULL;
}
